Perhaps you should try some spelling variations:
nang may » mang may, nang ma, bang may
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va thiet, va tuyen
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, dam thuc
su sai » su tai, su hai, su dai
sai ky » sac ky
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang may hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang may hoi. hieu ve ((cam tuc) OR (cam xuc)) van hanh vi va trien.
• Adding a wildcard symbol may retrieve word variants: su sai ky nang may hoi. hieu ve ((cam tuc) or (cam xuc)) van hanh vi va trien*.